How is this possible?

Things like this should not be happening in the 21st century.
Thankfully there are organizations trying to help.

http://www.nst.com.my/world/no-justi...girls-1.467402
Nine-year-old Manjita Chaudhary had never spent a night away from her parents when her father sold her to a Nepalese policeman for $25.
She left her family in western Nepal and travelled some 200 kilometres (124 miles) to her employer's home near the Indian border.
Her harsh new life began at 4am, the start of a daily routine in which she would clean her employer's house, wash dishes, cook and then go to his relatives' homes to do the same, before falling asleep just shy of midnight.
"I couldn't cope with the work, so my employer's wife would beat me with pots and pans, and threaten to sell me to another man," Chaudhary, now 22, told AFP.
"I was so scared, I couldn't even cry in front of them, I would just cry quietly in the bathroom," she said.
When she met her father a year later, she begged to return home, but her father, a bonded labourer, said they couldn't afford to raise her or her younger sister, whom they had also sold into domestic slavery.
Nepal's indentured "kamlari" girls -– some as young as six –- are among the Himayalan nation's most vulnerable citizens, subject to beatings and sexual violence while being kept as virtual prisoners by their employers.
Every January, when Nepal's Tharu community celebrates the Maghi festival, marking the end of winter, destitute Tharu families also sign contracts worth as little as 2,500 rupees ($25) a year, leasing their daughters to work in strangers' homes.
The annual tradition is unusual even in a region where illegal, bonded slavery and child labour are rife and where it is common to see children working in tea-shops, homes and even on construction sites.
A century ago the Tharu, said to be descendants of the Buddha, owned their farms and lived in relative isolation in the malaria-infested Terai plains, enjoying a natural resistance to the disease that the higher castes lacked.
But when malaria was eradicated from the fertile region in 1960, the Tharu were displaced by higher-caste farmers, becoming indebted serfs in their own land.
Many, like Chaudhary's impoverished parents, resorted to selling their daughters into domestic slavery, establishing the kamlari tradition, which, although outlawed in 2006, persists across the country.
Chaudhary worked for three years as a kamlari, enduring violence and sexual harassment, before activists from the US-based Nepal Youth Foundation approached her father and offered to support and educate his daughters if he ended their contracts.